The invention discloses a nanometer
silver colloid solution and a preparation method thereof. The nanometer
silver colloid solution is characterized in that the 100 ml of nanometer
silver colloid solution comprises the following raw materials of 0.1 to 10 g of complexing agents, 0.1 to 2 g of reducing agents, 0 to 5 g of dispersing agents, 0 to 8 g of
protective agents, PH (Potential Of
Hydrogen) conditioning agents for performing conditioning on the PH value within the range of 4 to 10, 0.002 to 0.4 g of
silver salts and the allowance
purified water. The complexing agents, the reducing agents, the dispersing agents, the
protective agents, the PH conditioning agents and the
silver salts are dissolved in water according to the sequential order, the aging reaction is performed under a certain condition, and the nanometer silver
colloid solution is obtained eventually. According to the preparation method, the severe reduction reaction is not required, the mild
polyol weak reducing agents are utilized, the
reaction rate is controlled by the complexing agents, and the nanometer silver
colloid solution is obtained at the low temperature. According to the nanometer silver
colloid solution which is prepared from the preparation method, the controllable range of the PH value is 4 to 10 and the nanometer silver colloid solution is colorless, transparent, discoloration-resistant, strong in stability and the like. The preparation method has the advantages of being simple in operation, wide in parameter adjustable range, low in
energy consumption, short in cycle, suitable for
mass production and the like.